Annual report pursuant to Section 13 and 15(d)

Schedule 12-14s - CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment Gain/Loss (Details)

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Schedule 12-14s - CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment Gain/Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income $ 493,591 $ 460,668 $ 321,688
Fair value beginning balance 3,248,046    
Total net change in unrealized appreciation (depreciation) (31,209) 25,010 (85,063)
Fair value ending balance 3,659,978 3,248,046  
Control investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 13,549 4,737  
Realized Gain (Loss) 0 0 0
Fair value beginning balance 115,004 76,458  
Gross Additions 1,734 29,175  
Gross Reductions 0 (13,263)  
Total net change in unrealized appreciation (depreciation) (3,559) 22,634 (278)
Fair value ending balance 113,179 115,004 76,458
Majority Owned Control Investments | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 12,857 4,047  
Realized Gain (Loss) 0 0  
Fair value beginning balance 103,487 68,416  
Gross Additions 1,734 15,912  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) (3,699) 19,159  
Fair value ending balance 101,522 103,487 68,416
Other Control Investments | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 692 690  
Realized Gain (Loss) 0 0  
Fair value beginning balance 11,517 8,042  
Gross Additions 0 13,263  
Gross Reductions 0 (13,263)  
Total net change in unrealized appreciation (depreciation) 140 3,475  
Fair value ending balance 11,657 11,517 8,042
Coronado Aesthetics, LLC | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss) 0 0 0
Fair value beginning balance 262 319  
Total net change in unrealized appreciation (depreciation) (193) (57) (246)
Fair value ending balance 69 262 319
Coronado Aesthetics, LLC | Majority Owned Control Investments | Control investments | Preferred Stock      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 260 313  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) (191) (53)  
Fair value ending balance 69 260 313
Coronado Aesthetics, LLC | Majority Owned Control Investments | Control investments | Common Stock      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 2 6  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) (2) (4)  
Fair value ending balance 0 2 6
Gibraltar Acquisition LLC | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss) 0 0  
Fair value beginning balance 62,512    
Total net change in unrealized appreciation (depreciation) (4,983) 9,656  
Fair value ending balance 59,263 62,512  
Gibraltar Acquisition LLC | Majority Owned Control Investments | Control investments | Unsecured Debt      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 5,447 3,439  
Realized Gain (Loss) 0 0  
Fair value beginning balance 34,478 21,700  
Gross Additions 1,734 9,912  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 0 2,866  
Fair value ending balance 36,212 34,478 21,700
Gibraltar Acquisition LLC | Majority Owned Control Investments | Control investments | Member Units      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 28,034 15,244  
Gross Additions 0 6,000  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) (4,983) 6,790  
Fair value ending balance 23,051 28,034 15,244
Hercules Adviser LLC | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss) 0 0 0
Fair value beginning balance 40,713 31,153  
Total net change in unrealized appreciation (depreciation) 1,477 9,560 7,163
Fair value ending balance 42,190 40,713 31,153
Hercules Adviser LLC | Majority Owned Control Investments | Control investments | Unsecured Debt      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 7,410 608  
Realized Gain (Loss) 0 0  
Fair value beginning balance 12,000 12,000  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 0 0  
Fair value ending balance 12,000 12,000 12,000
Hercules Adviser LLC | Majority Owned Control Investments | Control investments | Member Units      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 28,713 19,153  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 1,477 9,560  
Fair value ending balance 30,190 28,713 19,153
Tectura Corporation | Control investments      
Investments in and Advances to Affiliates [Line Items]      
Realized Gain (Loss) 0 0 0
Fair value beginning balance 11,517 8,042  
Total net change in unrealized appreciation (depreciation) 140 3,475 (227)
Fair value ending balance 11,657 11,517 8,042
Tectura Corporation | Other Control Investments | Control investments | Senior Secured Debt      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 692 690  
Realized Gain (Loss) 0 0  
Fair value beginning balance 8,250 8,042  
Gross Additions 0 0  
Gross Reductions 0 (13,263)  
Total net change in unrealized appreciation (depreciation) (223) 13,471  
Fair value ending balance 8,027 8,250 8,042
Tectura Corporation | Other Control Investments | Control investments | Preferred Stock      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 3,263 0  
Gross Additions 0 13,263  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 360 (10,000)  
Fair value ending balance 3,623 3,263 0
Tectura Corporation | Other Control Investments | Control investments | Common Stock      
Investments in and Advances to Affiliates [Line Items]      
Amount of Interest and Fees Credited to Income 0 0  
Realized Gain (Loss) 0 0  
Fair value beginning balance 4 0  
Gross Additions 0 0  
Gross Reductions 0 0  
Total net change in unrealized appreciation (depreciation) 3 4  
Fair value ending balance $ 7 $ 4 $ 0